Bugfixes and extension installation improvements

app/src/main/java/eu/kanade/tachiyomi/ui/extension/ExtensionDetailsController.kt

@@ -57,7 +57,7 @@ class ExtensionDetailsController(bundle: Bundle? = null) :
     override fun onViewCreated(view: View) {
         super.onViewCreated(view)
 
-        val extension = presenter.extension
+        val extension = presenter.extension ?: return
         val context = view.context
 
         extension_title.text = extension.name

app/src/main/java/eu/kanade/tachiyomi/ui/extension/ExtensionDetailsPresenter.kt

@@ -12,7 +12,7 @@ class ExtensionDetailsPresenter(
         private val extensionManager: ExtensionManager = Injekt.get()
 ) : BasePresenter<ExtensionDetailsController>() {
 
-    val extension = extensionManager.installedExtensions.first { it.pkgName == pkgName }
+    val extension = extensionManager.installedExtensions.find { it.pkgName == pkgName }
 
     override fun onCreate(savedState: Bundle?) {
         super.onCreate(savedState)
@@ -33,6 +33,7 @@ class ExtensionDetailsPresenter(
     }
 
     fun uninstallExtension() {
+        val extension = extension ?: return
         extensionManager.uninstallExtension(extension.pkgName)
     }
 }